.header{
    width: 100%;
    height: 60px;
    background:#409eff ;
}
.header_title{
    text-align: center;
    height: 100%;
    line-height: 60px;  
    font-size: 20px;  
}

html,body,.layout{
    height: 100%;
}


/* .layout{
    width: 180px;
    height: 100%;
    background: #e1dfdf;
}
.layout .nav .nav-item{
    width: 180px;
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid #fff;
} */

.layout{
    height: 100%;
   
}
.layout .nav-box{
    width: 180px;
    height: 100%;
    background: #e1dfdf;
}
.nav-box .nav .nav-item{
    width: 180px;
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid #fff;
}